After importing an STL if you try to rotate it using the transformations menu the part vanishes. the number of faces is still displayed in the mesh section, but dimensions are shown asn follows:
Width (mm) NaN
Depth (mm) NaN
Height (mm) NaN
Volume (ml)
Weight (g) NaN
this has been reproduced in both a locally checked out version and the demo linked directly in the repository. I have
tried several of my STL files to try to rule out a broken stl.
Setting rotation back to zero does not bring back the part. I have included 2 screenshots and a zip of one of the STLs used for the test.


stl.zip